CVE-2026-50411: Windows Active Directory Federation Services Denial of Service Vulnerability

Published Jul 14, 2026
·
Updated

Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

Other sources

Windows Active Directory Federation Services Denial of Service Vulnerability

— Microsoft

Affected Software

132 affected componentsFixes available
Microsoft .NET Framework=3.5
2.0.50727.8983 & 3.0.30729.8978
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
Microsoft .NET Framework=3.5
2.0.50727.8983 & 3.0.30729.8978
Microsoft .NET Framework=3.5, =4.8.1
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=4.6.2, =4.7, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0
Microsoft .NET Framework=3.5, =4.7.2
2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
Microsoft .NET Framework=3.5, =4.8
2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=4.8
4.8.4803.0
Microsoft .NET Framework=4.8.1
4.8.9340.0
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 21h2<10.0.19044.7548
Microsoft Windows 10 21h2<10.0.19044.7548
Microsoft Windows 10 21h2<10.0.19044.7548
Microsoft Windows 10 22h2<10.0.19045.7548
Microsoft Windows 10 22h2<10.0.19045.7548
Microsoft Windows 10 22h2<10.0.19045.7548
Microsoft Windows 11 24h2<10.0.26100.8875
Microsoft Windows 11 24h2<10.0.26100.8875
Microsoft Windows 11 25h2<10.0.26200.8875
Microsoft Windows 11 25h2<10.0.26200.8875
Microsoft Windows 11 26h1<10.0.28000.2525
Microsoft Windows 11 26h1<10.0.28000.2525
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
Microsoft Windows Server 2022<10.0.20348.5386
Microsoft Windows Server 2025<10.0.26100.33158
All of the following
Microsoft .NET Framework=4.8.1
Any of the following
Microsoft Windows 11 26h1
Microsoft Windows 11 26h1
All of the following
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1607
Microsoft Windows 10 1607
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016
All of the following
Any of the following
Microsoft .NET Framework=4.6.2
Microsoft .NET Framework=4.7
Microsoft .NET Framework=4.7.1
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8.1
Any of the following
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 11 23h2
Microsoft Windows 11 23h2
Microsoft Windows 11 24h2
Microsoft Windows 11 24h2
Microsoft Windows 11 25h2
Microsoft Windows 11 25h2
Microsoft Windows Server 2022
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.8
Any of the following
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 21h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows 10 22h2
Microsoft Windows Server 2019
Microsoft Windows Server 2022
All of the following
Any of the following
Microsoft .NET Framework=3.5
Microsoft .NET Framework=4.7.2
Any of the following
Microsoft Windows 10 1607
Microsoft Windows 10 1607
Microsoft Windows 10 1809
Microsoft Windows 10 1809
Microsoft Windows Server 2016
Microsoft Windows Server 2019
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows Server 2022<10.0.20348.5386
10.0.20348.5386
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.9339.0
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.9339.0
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.9340.0
Microsoft .NET Framework=3.5, =4.8.1, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.9339.0
Microsoft .NET Framework=4.6.2, >=4.7<4.7.4143.0, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=4.6.2, >=4.7<4.7.4143.0, =4.7.1, =4.7.2
4.7.4143.0
Microsoft .NET Framework=3.5, =4.7.2, >=2.0.50727<2.0.50727.8983, >=3.0.30729<3.0.30729.8978
2.0.50727.89833.0.30729.89784.7.4143.0
Microsoft .NET Framework=3.5, =4.7.2, >=2.0.50727<2.0.50727.9069, >=3.0.30729<3.0.30729.9067
2.0.50727.90693.0.30729.90674.7.4143.0
Microsoft .NET Framework=3.5, >=4.8<4.8.4803.0, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.4803.0
Microsoft .NET Framework=3.5, >=4.8<4.8.4803.0, >=2.0.50727<2.0.50727.9069, >=3.0.30729<3.0.30729.9067
2.0.50727.90693.0.30729.90674.8.4803.0
Microsoft .NET Framework=3.5, >=4.8<4.8.4803.0, >=2.0.50727<2.0.50727.9182, >=3.0.30729<3.0.30729.9168
2.0.50727.91823.0.30729.91684.8.4803.0
Microsoft .NET Framework>=4.8<4.8.4803.0
4.8.4803.0
Microsoft .NET Framework>=4.8<4.8.4803.0
4.8.4803.0
Microsoft .NET Framework>=4.8<4.8.4803.0
4.8.4803.0
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.8875
10.0.26100.8875
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.8875
10.0.26200.8875
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.8875
10.0.26200.8875
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.8875
10.0.26100.8875
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 10=1607, >=10.0.14393<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.2525
10.0.28000.2525
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.2525
10.0.28000.2525
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7548
10.0.19045.7548
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7548
10.0.19045.7548
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7548
10.0.19044.7548
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7548
10.0.19044.7548
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9020
10.0.17763.9020
Microsoft Windows 10=21H2, >=10.0.19044<10.0.19044.7548
10.0.19044.7548
Microsoft Windows 10=22H2, >=10.0.19045<10.0.19045.7548
10.0.19045.7548
Microsoft Windows 10=1809, >=10.0.17763<10.0.17763.9020
10.0.17763.9020

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978Patch KB5100984
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168Patch KB5101014
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0Patch KB5101003
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101001
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101004
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0Patch KB5100998
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978Patch KB5100985
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101000
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0Patch KB5101005
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4143.0Patch KB5100991
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.7.4143.0Patch KB5100990
  12. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0Patch KB5099535
  13. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0Patch KB5100989
  14. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0Patch KB5101006
  15. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0Patch KB5101010
  16. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0Patch KB5101008
  17. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101009
  18. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101011
  19. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.4803.0Patch KB5101007
  20. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 4.8.9340.0Patch KB5101002
  21. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.33158Patch KB5099536
  22. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.2.9200.26226Patch KB5099445
  23. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 6.3.9600.23291Patch KB5099444
  24. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.14393.9339Patch KB5099535
  25. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.17763.9020Patch KB5099538
  26. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.20348.5386Patch KB5099540
  27. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.9339.0Patch KB5101004
  28. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.9339.0Patch KB5101001
  29. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.9340.0Patch KB5100998
  30. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.9339.0Patch KB5101000
  31. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.9339.0Patch KB5101005
  32. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.8983Fixed in 3.0.30729.8978Fixed in 4.7.4143.0Patch KB5099535
  33. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069Fixed in 3.0.30729.9067Fixed in 4.7.4143.0Patch KB5100989
  34. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.4803.0Patch KB5101006
  35. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9069Fixed in 3.0.30729.9067Fixed in 4.8.4803.0Patch KB5101008
  36. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 2.0.50727.9182Fixed in 3.0.30729.9168Fixed in 4.8.4803.0Patch KB5101010
  37. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.8875Patch KB5101650
  38. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26200.8875Patch KB5101650
  39. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.28000.2525Patch KB5101649
  40. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19045.7548Patch KB5099539
  41. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19044.7548Patch KB5099539

Event History

Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:07 PM
Data Sourced
via MITRE·05:07 PM
DescriptionSeverity
Data Sourced
via NVD·06:17 PM
RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2026-50411?

The severity of CVE-2026-50411 is rated high with a score of 7.5.

2

How do I fix CVE-2026-50411?

To fix CVE-2026-50411, apply the latest security updates provided by Microsoft for affected software.

3

What systems are affected by CVE-2026-50411?

CVE-2026-50411 affects Microsoft .NET Framework, Windows 10, Windows 11, and several versions of Windows Server.

4

What type of vulnerability is CVE-2026-50411?

CVE-2026-50411 is a stack-based buffer overflow vulnerability in Active Directory Federation Services.

5

What impact does CVE-2026-50411 have?

CVE-2026-50411 could allow an unauthorized attacker to cause a denial of service over a network.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203